package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.constant.JwtClaimsConstant;
import com.sky.enumeration.OperationType;
import com.sky.utils.ThreadLocalUtil;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.util.Map;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {

    }

    /**
     * 前置通知，在通知中进行公共字段赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段的自动填充");
        // 获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();  // 方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);  // 获得方法上的注解对象
        OperationType operationType = autoFill.value();  // 获得数据库操作类型

        // 获取到当前被拦截的方法的参数 实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        // 准备赋值的数据
        Map<String, Object> map = ThreadLocalUtil.get();
        Long empId = Long.valueOf((Integer) map.get(JwtClaimsConstant.EMP_ID));
        LocalDateTime now = LocalDateTime.now();

        // 根据当前不同的操作类型，为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT) {
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            setCreateUser.invoke(entity, empId);
            setCreateTime.invoke(entity, now);
        } else {
            assert operationType == OperationType.UPDATE;
        }
        Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
        Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
        setUpdateUser.invoke(entity, empId);
        setUpdateTime.invoke(entity, now);
    }


}
